Parnassus on Wheels is a 1917 novel written by Christopher Morley and published by Doubleday, Page & Company. The title refers to the Mount Parnassus of Greek mythology; it was the home of the Muses.
It is about a fictional traveling book-selling business. The original owner of the business, Roger Mifflin, sells it to 39-year-old Helen McGill, who is tired of taking care of her ailing older brother, Andrew.